Takeshi kuwauchi



United States Patent M 3,124,045 PLUNGER RECIPROCATING MEANS FOR OIL-FEEDING DEVICES Takeshi Kuwauchi, Tokyo, Japan, assignor to Toyoo Yamada, Tokyo, Japan Filed Feb. 4, 1963, Ser. No. 255,844 Claims priority, application Japan Apr. 12, 1962 3 Claims. (Cl. 91-342) This invention relates to a novel and useful reciprocating means of a simple construction, of which assembling and overhauling are easy, and from which the feed of oil is facilitated for oil feeding devices.

One object of the present invention is to provide a plunger reciprocating means for oil feeding devices, wherein a suction pump rod is reciprocated in a cylinder of a suction pump by reciprocating the plunger rod along a slide bore, thereby sucking up oil or paint and exactly feeding it to another place.

A further object of this invention is to provide a plunger reciprocating means for an oil feeder or the like, which is adapted to effect relative vertical sliding for two portions, that is, a sliding tube having a piston which in turn is equipped with a plunger rod as well as upper and lower annular packings on one end, and a sliding cylinder on the other, and also adapted to exactly start from any position of the piston without stopping, for instance, at the end of stroke and reverse firmly due to compressed air, thereby enabling a smooth vertical reciprocable movement of said piston, thus assuring an exact feeding of oil and in which the construction is remarkably simple and both assembly and overhauling are easy.

In the following, the present invention is described in further detail in connection with two embodiments of this invention. However, the present invention is by no way limited by the specification as well as appended drawings, inasmuch as many modifications may be possible without departing from the spirit and scope of the invention defined in the appended claims.

The present invention is described in connection with embodiments of this invention, in the accompanying drawings, of which FIG. 1 and FIG. 2 are longitudinal sectional front views of the present invention. Similar parts are represented by similar symbols throughout the drawings.

According to the first embodiment illustrated in FIG. 1, a cylindrical chamber 2 is provided, extending in upper and lower directions from the central portion of a machine body 1, and a piston 3 is inserted in the cylindrical chamber 2 so as to be freely slidable therein and separate the chamber 2 into an upper chamber A and a lower chamber B. To the lower portion of piston 3, the upper end portion of a plunger rod 4 is secured at the center of the piston 3. The plunger rod 4 is suitably bored to define a longitudinal hole 5 formed in the upper portion thereof. A number of perforations 6 are provided at the upper portion of plunger rod 4, while a compression spring 7 is mounted in the bottom of the longitudinal hole 5.

The piston 3 has a central slide bore 8 through which a sliding tube It! provided with a vertical passage 9 is vertically and slidably disposed. The lower portion of sliding tube 19 is inserted in the longitudinal hole 5 and a pushing body 11 is secured to the lower end portion; adjacent and spaced above the pushing body 11, the tube is formed with several perforations 12, and a compression spring 13 is arranged around the peripheral portion in engagement with the pushing body 11.

The upper portion of the sliding tube 10 is connected to a sliding cylinder having a vertically extending passage 14 communicating with tube passage 9; several per- 3,124,045 Patented Mar. 10, 1964 forations 16, 17 are respectively provided at the upper and lower portions of said sliding cylinder 15. Below the upper perforation 16, upper and lower annular packings 18, 19 are provided opposite to each other, and an annular projection 20 is provided below the lower perforation 17.

A longitudinal slide bore 22 is provided in the head 21 of the machine body 1, and annular recesses 23, 24 are respectively disposed at the upper and lower portions thereof. An annular passage 25 has an inner portion opening into the central part of the upper annular recess 23 and has an outer portion defining an outlet 26. A passageway 27 establishes communication between cylinder chamber A and the lower portion of the upper annular recess 23. An annular cylindrical valve body 29 loaded by a compressive spring 28 is vertically and slidably inserted in the lower annular recess 24. An exhaust hole 30 is provided at the upper portion of the lower annular recess 24 while an inlet 31 is provided at the lower portion. An annular opening 32 in the lowermost part of the head 21 establishes communication between the lower portion of the lower annular recess 24 and the cylinder chamber A7 The upper and lower annular packings 18, 19 of the sliding cylinder 15 which is in turn vertically and slidably inserted in the slide bore 22 are placed adjacent to the upper and lower portions of the annular passage 25. The upper surface of the annular projection 20 contacts the annular cylindrical valve body 29 while its lower surface defines a valve member between the lower portion of the lower annular recess 24 and the cylinder chamber A.

The lower portion of the machine body 1 is provided with a sliding hole 33 which is counterbored to define a suction hole 34 at the lower portion thereof and a feeding hole 35 opens into the side of the suction hole 34. The upper end portion of a suction pump rod 36 is secured to the lower end of the plunger rod 4 which is vertically and slidably inserted in the slidable hole 33 while an upper end portion of the suction pump tube 37 is secured to the wall of the suction hole 34.

The operation of this apparatus will now be described as follows: Fluid, for instance, such as compressed air charged from an inlet hole 31 of the head 21 of machine body 1, enters the lower portion of the lower annular recess 24 causing the annular cylindrical valve body 29 to be raised against compression spring 28, with the air 'in the upper portion of the annular recess 24 being discharged outside through exhaust hole 3!? whereby the inlet hole 31 communicates with the lower perforation 17 of the sliding cylinder 15 through the lower portion of the annular recess 24. The compressed air is then fed through the perforation 17 into the passages 14, 9 respectively of the sliding cylinder 15 and the sliding tube 19. From the passage 9, the compressed air is fed through the perforation 12 into the longitudinal hole 5 of the plunger rod 4 and hence through the perforation 6 into the lower chamber B of the cylinder chamber 2 to lift the piston 3.

With rise of the piston 3, the air in the upper chamber A of the cylinder 2 is moved through the passageway 27 into the lower annular recess 23, whence it is discharged outwardly from the annular passage 25 through the outlet 26, and simultaneously the plunger rod 4 is raised by the piston; as soon as the lower surface of the pushing body 11 is engaged by the upper portion of the lower compression spring 7, the tube 10 and the sliding cylinder 15 are raised along the slide bores 8 and 22, respectively. The lower' annular packing 19 of the sliding cylinder 15 is thus moved into contact with the lower surface of the annular passage 25 to close passage 25 and cut oif the exhaust communication between the outlet the passageway 25 and passage 27. The upward movement of the tube 10 and the sliding cylinder 15 causes the upper peripheral surface of the annular projection 20 to 60 contact with the lower surface of the annular cylindrical valve body 29 to cut off the communication of the inlet 31 with the passage 17 and simultaneously causes the lower annular surface of projection 20 away from passage 32 to communicate the inlet 31 with the annular passage 32 through the lower portion of the annular recess 24, whereby compressed air is fed into the upper chamber A of the cylinder 2 from the annular passage 32 to push down the piston 3.

With descent of the piston 3, the air in the lower chamber B of the cylinder 2 is forced back through the perforation 6 into the longitudinal hole of the plunger rod 4-, thence through the perforation 12 into passages 9 and 14 of the sliding tube 11 and the sliding cylinder 15 and then through the perforation 16 into the upper annular recess 23 from which it is discharged outwardly from an outlet 26 through the annular passage 25. At the same time the plunger rod 4 is being lowered with the piston 3 and as soon as the upper surface of the pushing body is engaged by the lower portion of the upper compression spring 12, the sliding tube and the sliding cylinder 15 are lowered. The upper annular packing 18 of the sliding cylinder 15 is thus moved into contact with the upper surface of the annular passage 25 of the annular recess 23 to close the passage 25 and cut off the communication between the perforation 16 and the outlet passage 26.

In such a manner, the plunger rod 4 is advanced and retreated reciprocatingly along sliding hole 33, in order to reciprocate suction pump rod 36 in suction pump cylinder 37 to suck up oil, paint or the like which is then fed from the suction hole 34 through the outlet 35. Thus, the plunger rod 4 is exactly subjected to the advancing and retreating motion reciprocatingly.

According to the second embodiment illustrated in FIG. 2, the compression spring 28 for the annular cylindrical valve body 29, which is not always necessary in the first embodiment illustrated in FIG. 1, is removed. However, if necessary, the compression spring 28 may be mounted as shown in FIG. 1. However, the exhaust hole 30 is eliminated so that there is only a single exhaust port, namely, 26. In FIG. 2, an annular passage 30 establishes communication between the upper and lower annular recesses 23 and 24-. When fluid, for instance, such as compressed air is fed through the inlet 31 of the head portion 21 of machine body 1, the annular cylindrical valve body 29 in the lower annular recess 24 is raised, while the air above the valve body 29 in the annular recess 24 the upper annular recess 23 is forced through the passage 30' into the lower portion of 23; and the inlet 31 then communicates with the lower perforation 17 for operating the plunger rod 4 in the same manner as described in connection with FIG. 1.

In accordance with the present invention as constructed in FIGS. 1 and 2, when fluid, such as compressed air, is fed through the inlet 31 to reciprocate the piston 3 up and down for reciprocating the plunger rod 4 up and down, the sliding tube and the sliding cylinder are caused to slide up and down by the vertical reciprocation of the piston 3; with said movement, the upper and lower portions of the annular passage 25 will be opened and closed by the upper and lower annular packings 18 and 19 and simultaneously the communication between the inlet 31 and the upper and lower chambers A and B of the cylinder 2 is opened and closed by the annular projection whereby the annular cylindrical valve body 29 is actuated up and down. Accordingly, the piston 3 and the plunger rod 4 are moved up and down continuously and relatively with regard to two portions, one is the sliding tube 10 and the other the sliding cylinder 15 which includes the upper and lower annular packings 18 and 19. Thus, the construction may be effected extremely compact and simple and may be exactly started at any position of the piston 3, without stopping, for instance, at the final end of stroke, and the up and down reciprocation of the piston 3 may be accomplished smoothly by the exact change over with compressed air. With such an arrangement, feeding oil may be exactly proportioned by regularly reciprocating the plunger 4.

What I claim is:

l. Plunger reciprocating means for an oil feeding device or the like comprising a machine body having a piston chamber and a closure head therefor, a slidable piston separating said piston chamber into upper and lower chambers, a plunger rod slidably extending through said body into said lower chamber with an internal end secured to said piston and an external end adapted to be connected to a pump rod, bore means in said plunger rod, and passage means through said plunger rod establishing communication between said bore means and said lower chamber, said piston housing a central bore, a hollow sliding tube defining an internal passage, said tube having upper and lower ends and having an intermediate portion slidably extending through the central bore of said piston, perforation means in said sliding tube adjacent the lower end thereof establishing communication between said bore means and said internal passage, a pushing element secured to the lower end of said tube, compression spring means spaced in said bore means on opposite sides of said pushing element to bias the same upon movement in two directions, means defining a slide bore in said closure head and upper and lower annular recesses on opposite ends of said slide bore, a slide cylinder in said slide bore having an upper end in said upper annular recess and a lower end in said lower annular recess, the lower end of said slide cylinder being attached to the upper end of said tube for unitary movement therewith and having an internal bore communicating with the internal passage of said tube, aperture means through said slide cylinder adjacent its upper end establishing communication between said internal bore and said upper annular recess, annular passage means in said upper annular recess separating the same in upper and lower portions, outlet means in said closure head communicating with said annular passage means for exhausting the same, upper and lower annular packings fixed to said slide cylinder below said aperture means so as to be on opposite sides of annular passage means for alternate control thereof, a passageway in said closure head establishing communication between said upper chamber and the lower portion of said upper annular recess, valve means in said lower annular recess separating the same into upper and lower parts, passage means in said closure head establishing communication between said upper chamber and the lower part of said lower annular recess, an annular projection on the lower end of said slide cylinder to control said passage means leading from the lower part of said lower annular recess, second aperture means in said slide cylinder adjacent said annular projection establishing communication between said internal bore and the lower part of said lower annular recess, said valve means engaging said annular projection to close said second aperture means, inlet means commuicating with the lower part of said lower annular recess and being adapted to guide compressed fluid therein causing movement of said valve means away from said annular projection to open said second aperture means, and exhaust means for the upper part of said lower annular recess.

2. The combination as recited in claim 1 wherein said exhaust means comprises an exhaust passageway extending from the upper part of said lower annular recess to the exterior of said closure head.

3. The combination as recited in claim 1 wherein said exhaust means comprises an exhaust passageway extendthe lower portion of said upper annular recess.

(References on following page) References Cited in the file of this patent UNITED STATES PATENTS Irwin Aug. 27, 1912 Sterrett July 15, 1952 Shalf Feb. 3, 1953 Mohler June 26, 1956 6 Mueller et a1 Dec. 19, 1961 Meeker Feb. 6, 1962 FOREIGN PATENTS Germany Apr. 23, 1956 Sweden May 26, 1925 Switzerland Mar. 30, 1910 

1. PLUNGER RECIPROCATING MEANS FOR AN OIL FEEDING DEVICE OR THE LIKE COMPRISING A MACHINE BODY HAVING A PISTON CHAMBER AND A CLOSURE HEAD THEREFOR, A SLIDABLE PISTON SEPARATING SAID PISTON CHAMBER INTO UPPER AND LOWER CHAMBERS, A PLUNGER ROD SLIDABLY EXTENDING THROUGH SAID BODY INTO SAID LOWER CHAMBER WITH AN INTERNAL END SECURED TO SAID PISTON AND AN EXTERNAL END ADAPTED TO BE CONNECTED TO A PUMP ROD, BORE MEANS IN SAID PLUNGER ROD, AND PASSAGE MEANS THROUGH SAID PLUNGER ROD ESTABLISHING COMMUNICATION BETWEEN SAID BORE MEANS AND SAID LOWER CHAMBER, SAID PISTON HOUSING A CENTRAL BORE, A HOLLOW SLIDING TUBE DEFINING AN INTERNAL PASSAGE, SAID TUBE HAVING UPPER AND LOWER ENDS AND HAVING AN INTERMEDIATE PORTION SLIDABLY EXTENDING THROUGH THE CENTRAL BORE OF SAID PISTON, PERFORATION MEANS IN SAID SLIDING TUBE ADJACENT THE LOWER END THEREOF ESTABLISHING COMMUNICATION BETWEEN SAID BORE MEANS AND SAID INTERNAL PASSAGE, A PUSHING ELEMENT SECURED TO THE LOWER END OF SAID TUBE, COMPRESSION SPRING MEANS SPACED IN SAID BORE MEANS ON OPPOSITE SIDES OF SAID PUSHING ELEMENT TO BIAS THE SAME UPON MOVEMENT IN TWO DIRECTIONS, MEANS DEFINING A SLIDE BORE IN SAID CLOSURE HEAD AND UPPER AND LOWER ANNULAR RECESSES ON OPPOSITE ENDS OF SAID SLIDE BORE, A SLIDE CYLINDER IN SAID SLIDE BORE HAVING AN UPPER END IN SAID UPPER ANNULAR RECESS AND A LOWER END IN SAID LOWER ANNULAR RECESS, THE LOWER END OF SAID SLIDE CYLINDER BEING ATTACHED TO THE UPPER END OF SAID TUBE FOR UNITARY MOVEMENT THEREWITH AND HAVING AN INTERNAL BORE COMMUNICATING WITH THE INTERNAL PASSAGE OF SAID TUBE, APERTURE MEANS THROUGH SAID SLIDE CYLINDER ADJACENT ITS UPPER END ESTABLISHING COMMUNICATION BETWEEN SAID INTERNAL BORE AND SAID UPPER ANNULAR RECESS, ANNULAR PASSAGE MEANS IN SAID UPPER ANNULAR RECESS SEPARATING THE SAME IN UPPER AND LOWER PORTIONS, OUTLET MEANS IN SAID CLOSURE HEAD COMMUNICATING WITH SAID ANNULAR PASSAGE MEANS FOR EXHAUSTING THE SAME, UPPER AND LOWER ANNULAR PACKINGS FIXED TO SAID SLIDE CYLINDER BELOW SAID APERTURE MEANS SO AS TO BE ON OPPOSITE SIDES OF ANNULAR PASSAGE MEANS FOR ALTERNATE CONTROL THEREOF, A PASSAGEWAY IN SAID CLOSURE HEAD ESTABLISHING COMMUNICATION BETWEEN SAID UPPER CHAMBER AND THE LOWER PORTION OF SAID UPPER ANNULAR RECESS, VALVE MEANS IN SAID LOWER ANNULAR RECESS SEPARATING THE SAME INTO UPPER AND LOWER PARTS, PASSAGE MEANS IN SAID CLOSURE HEAD ESTABLISHING COMMUNICATION BETWEEN SAID UPPER CHAMBER AND THE LOWER PART OF SAID LOWER ANNULAR RECESS, AN ANNULAR PROJECTION ON THE LOWER END OF SAID SLIDE CYLINDER TO CONTROL SAID PASSAGE MEANS LEADING FROM THE LOWER PART OF SAID LOWER ANNULAR RECESS, SECOND APERTURE MEANS IN SAID SLIDE CYLINDER ADJACENT SAID ANNULAR PROJECTION ESTABLISHING COMMUNICATION BETWEEN SAID INTERNAL BORE AND THE LOWER PART OF SAID LOWER ANNULAR RECESS, SAID VALVE MEANS ENGAGING SAID ANNULAR PROJECTION TO CLOSE SAID SECOND APERTURE MEANS, INLET MEANS COMMUNICATING WITH THE LOWER PART OF SAID LOWER ANNULAR RECESS AND BEING ADAPTED TO GUIDE COMPRESSED FLUID THEREIN CAUSING MOVEMENT OF SAID VALVE MEANS AWAY FROM SAID ANNULAR PROJECTION TO OPEN SAID SECOND APERTURE MEANS, AND EXHAUST MEANS FOR THE UPPER PART OF SAID LOWER ANNULAR RECESS. 